OSXControl allows you to shut down, reset or put
to sleep an Apple computer running OS X after a
set time lapse. A plugin architecture is supported
for user extensions. It also has automation
features and G4 optimization.

upsguru is a daemon that monitors a UPS connected to a
serial port. It has been extensively tested with a rebadged
Centralion UPS. It communicates with init via the /dev/
initctl FIFO in order to control system services in the event
of a power failure. The sample scripts include commands for
SMS notification using gnokii. Protocol details are also
contained in the archive.

Cpuspeedy allows you to change the clock speed and voltage of CPUs using
Linux's CPUFreq driver. It is a user space program, so it will work on
every processor supported by the kernel's CPUFreq driver.

upschk is a UPS monitor daemon for Advance-Intelligent UPSes such as X
power Piconet and Micronet, Megatec, Falcon SG, etc. On power failure
and restoration, it calls external scripts to perform a system shutdown.
It supports power status logging in specified intervals via syslog. It
works in both interactive and daemon modes.

Remote SNMP Powerswitch Control is a script that
uses SNMP to control an APC PowerSwitch power
controller. It allows you to cycle any port via
the command line. This is useful for automatically
rebooting machines that stop responding to pings,
for example.

MonAMI aims to be a standard place for monitoring
the availability and performance of services. It
can talk to many different monitoring systems
while remaining easy to configure. It has a plugin
structure, making it easy to add new things to
monitor or to integrate with new monitoring
systems.